From FibreMood:
Casual, comfy, and yet still classy – the Joy T-shirt dress has got us jumping for… joy! It has a clean look with a handful of choice details, such as the crew neck with neck binding in trim fabric, a cord and cord stopper at the waistline, and wide raglan sleeves that you can alter to be more fitted, if you prefer.
Make Joy in a cosy knit, such as French terry, interlock, sweatshirt fabric, etc. The neck band should be made in (ribbed) trim fabric to make the dress easy to pull on over your head.